crccheck

library1.3.1pypypi✓ verified 28d ago

crccheck is a Python library (currently v1.3.1) for calculating various Cyclic Redundancy Checks (CRCs) and checksums from binary data. It includes over 170 CRC algorithms and simple additive/XOR checksums. The library maintains an active, though somewhat irregular, release schedule, with recent updates adding new CRC algorithms.

serialization

pip install crccheck

github ↗package ↗

INSTALL

IMPORT

SIG · CRCCHECK

crccheck

serializationpythonv1.3.1

Install

1.5s avg

Import

11ms

Disk

16MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v1.3.1 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.012s · 18MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.5s · import 0.006s · 18MB

16MB installed

● package 16MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Crc32

✓ from crccheck.crc import Crc32

Checksum8

✓ from crccheck.checksum import Checksum8

Crc

✓ from crccheck.crc import Crc

Use the general Crc class for custom CRC parameters not pre-implemented.

Demonstrates how to perform a quick CRC calculation on a single data block and how to process multiple data blocks sequentially. Input data should be in bytes or bytearray format.

from crccheck.crc import Crc32 data_bytes = bytearray.fromhex("DEADBEEF01020304") # Quick calculation for a single data block calculated_crc = Crc32.calc(data_bytes) print(f"CRC-32 for {data_bytes.hex()}: {calculated_crc:08X}") # Calculation over multiple data blocks multi_block_data1 = b"Hello" multi_block_data2 = b"World" crc_instance = Crc32() crc_instance.process(multi_block_data1) crc_instance.process(multi_block_data2) final_crc = crc_instance.final() print(f"CRC-32 for multiple blocks: {final_crc:08X}")

Debug

Known issues

breakingOlder versions (prior to v0.3) had a different package name (not specified but taken on PyPI) and used `bigendian=True/False` arguments. These were changed to `crccheck` and `byteorder='big'/'little'` respectively.

fix

Ensure your code uses `crccheck` for imports and `byteorder='big'` or `byteorder='little'` for endianness specification.

affects: <0.3

gotchaInput data for CRC and checksum calculations must be binary (bytes or bytearray) in Python 3. Passing a regular string will result in a TypeError or incorrect results, as the library operates on byte sequences.

fix

Convert string data to bytes using `your_string.encode('utf-8')` or `bytearray.fromhex('...')` before passing it to `crccheck` functions.

affects: All versions (Python 3)

gotchaThe `calc()` class method is suitable for quick calculations on a single complete data block. For calculations involving multiple sequential data blocks, you must instantiate the CRC/checksum class, feed data using `process()`, and retrieve the final result with `final()`.

fix

For fragmented or streaming data, use an instance: `crc_inst = Crc32(); crc_inst.process(block1); crc_inst.process(block2); final_crc = crc_inst.final()`.

affects: All versions

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'crccheck'

The 'crccheck' library is not installed in your Python environment.

fix

pip install crccheck

TypeError: a bytes-like object is required, not 'str'

The crccheck library functions, such as `calc()`, expect binary data (bytes or bytearray) as input, but a regular Python string was provided.

fix

Convert your string data to bytes using `your_string.encode('utf-8')` or `bytes(your_string, 'utf-8')` before passing it to crccheck functions.

from crc import Crc32

This import statement incorrectly assumes 'crc' is a top-level package or module directly containing 'Crc32'. The 'Crc32' class is located within the 'crccheck.crc' subpackage.

fix

Use the correct import path: `from crccheck.crc import Crc32`.

Upgrade

Version history

1.3.1latest on PyPI · released Jul 10, 2025

Audit

Dependencies

No dependency data recorded yet.

Agent activity

14 hits · last 30 days

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Resources

githubhttps://github.com/MartinScharrer/crccheck ↗

packagehttps://pypi.org/project/crccheck/ ↗